Temperature dependence of the Faraday effect in Rh4+-substituted magnetic garnets

The temperature dependence of the Faraday rotation (FR) spectra is measured at temperatures between 60 and 300 K in the wavelength range of 0.7–1.6 μm for single crystalline $({\mathrm{Y}}^{\mathrm{3+}}{\mathrm{,\hspace{0.5em}Ca}}^{\mathrm{2+}}{)}_3({\mathrm{Fe}}^{\mathrm{3+}}{\mathrm{,\hspace{0.5em}Rh}}^{\mathrm{4+}}{)}_5{\mathrm{O}}_{\mathrm{12}}$ films grown by a liquid phase epitaxy method onto (111)-oriented gadolinium gallium garnet substrates. In addition, the FR spectra at some temperatures are calculated by a molecular field approximation, and the calculated spectra are reproduced well by assuming the molecular field ${\text{155⋅〈S}}_Z^{\mathrm{Fe}}\mathrm{〉(}{\mathrm{cm}}^{\mathrm{-1}}\mathrm{),}$ where ${\mathrm{〈S}}_Z^{\mathrm{Fe}}〉$ is a thermal average of an iron spin $S_Z^{\mathrm{Fe}}$ in magnetic garnets.